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The Gravitic Drive is a less efficient version of the M-Drive. Usually powered by an integral Fusion+, it does not require a separate Power Plant. [1]

G-Drives are governed by the 10D limit, and are best suited to operation near worlds (or near stars). Beyond the 10D limit, G-Drives operate at 1% efficiency.[1]

ContraGravity drives are not real maneuver drives, and aren't useful outside of a gravity well. Their primary use is Gravcraft. By 10 diameters out from a planet, the ContraGravity drive is virtually worthless. Ships that use ContraGravity still need another form of maneuver drive to get out to jump distance. [2]

The second major breakthrough is artificial gravity. Created by manipulating subatomic forces, artificial gravity is not anti-gravity but is instead a unique force that acts upon the natural gravity field created by all matter. Artificial gravity can be made to either push or pull. Because of its nature, artificial gravity is not a very efficient means of locomotion in deep space where there are no strong gravity wells to push against. [3]